Do you have adapter cable to fit your trolling motor for any depth finder right now?
If not, I would get on Walleye central and bass boat central, sign up then post what you are looking for. Since the Minkota has been used much more up north by walleye fishermen may be your best shot. You might also post your question on the boards for up north, I'll, Iowa Nebraska, mich, Wisconson, Minnesota. Also might want to contact Brian at BBG marine. He may be able to help you.